Fluid-brake mechanism.



W. H. DAILY.

PATENTED JULY 2s, 1907.

FLUID BRAKE MEGHANISM.

APPLIOATION FILED 0UT.25, 1906.

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INVENTR A PATENTED JULY 23, 1907.

APPLICATION FILED 00T.25. 1906.

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VENTOR W] NESSS 5@ /l f 5% PATENTED JULY 23, 1907.

W. H. DAILY.

FLUID BRAKEMECHANISM. APRLIOATION FILED 00T.25. 1m.

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WILLIAM HENRY DAILY, OF TUCSON, ARIZONA TERRITORY.

FLUID-BRAKE MECHANISM.

- Speccation of Letters Patent.

Patented July 23, 1907.

Applicationled October 25,1906. Serial No. 340,517.

To all whom it may concern:

Beit known that I, WiLLmM HENRY DAILY, a resident of Tucson, in the county of Pima and Territory of Arizona, have invented certain new and useful Improvements in Fluid-Brake Mechanism; and 1 do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

-rNIy invention relates to improvements in fluid pressure brakes, and more particularly to hydraulic brake operating mechanism, the object of the invention being to provide an apparatus of this character of eX- tremely simple, inexpensive construction, and strong and durable in use.

A further object is to provide an improved controlling means Which insures the operation of the brakes in the event of injury to the controlling means.

With these and other objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts as will be more fully hereinafter described and pointed out in the Claims.

In the accompanying drawings, Figure 1 is a view in longitudinal section illustrating my improvements in normal position. Fig. 2 is a similar view showing the position of the parts when the brakes are applied, and Fig. 3 is a view in section on the line of Fig. 2.

1 representsa car axle having two eccentrics 2 secured thereon and continuously reciprocating pitmen 3, connected with pump pistons 4 in parallel cylinders 5 and said eccentrics are so disposed as to reciprocate the respective pistons in opposite directions. Above the cylinders 5 and parallel therewith is a larger cylinder 6 in which a plunger 6L is mounted and connected by a rod with the brake operating levers (not shown). The cylinders 5 and 6 are preferably formed in a single casting and the inner end of cylinder communicates with an enlarged chamber 7, with which ducts 8 communicate and connect the chamber 7 with the cylinders 5 and flap or other suitable valves 9 are located above the ducts 8 to permit the passage of fluid in one direction only.

A reservoir l0 is secured to the bottom of the casting and preferably contains oil up to approximately the level shown. Pipes l1 having check valves 11:L therein, communicate with the inner ends of cylinders 5 and project down below the fluid level in reservoir 10 and preferably to near the bottom thereof.

Alined openings 12, 13 and 14 respectively are provided in the horizontal partition walls of the casting, to receive a tubular valve 15 which latter projects across and closes a duct 15SL connecting cylinders 5. The:

opening 12 in the top wall of the casting is larger than the other openings toi receive the enlarged upper portion of the valve l5, which latter has an annular shoulder 16 for a purpose which will more fully hereinafter appear. The upper portion of valve 15 is located in, and projects through a casing 17, which latter is secured to the top of the cylinder casting, and provided with a lug 18 to which a lever 19 is pivotally secured near one end. This lever 19 is provided with a weight 20 on its long end and is connected between its pivoted point and weighted end, with the upper end of the stem 21 of valve 15, which stem projects through the top of casing 17.

The short end of lever 19 is connected by a link 22 with a plunger 23 located in a cylinder 24, and a flexible pipe 25 connects the end of the cylinder 24 with a fluid pipe line 26 extending throughout the car, and having pistons 27 in its ends, operated by lever 28 or other suitable mechanism to force the fluid into the cylinder 24 or permit its escape therefrom, and thereby permit the control of the brake mechanism from both ends ofthe car.

The operation of my improvements is as follows:- The normal position of the several parts is shown in Fig. 1, the valve 15 being held in an elevated position by the fluid controlling mechanism above. When the parts are in this position, the pistons 4 can reciprocate without disturbing the oil as they will draw air up through the opening 14, or force the air from one cylinder 5 to the other through duct 15a and back again as the pistons 4 reciprocate in opposite directions.

To apply the brakes, the operator moves the piston 27 at either end of the pipe line 26 outward which permits the fluid in cylinder 24 to be forced into the pipe line 26 by the upward movement of plunger 23, as the weight 20 moves the weighted end of the lever 19 downward and moves the valve 15 downward to close the opening 14. The pistons 4 then suck oil up pipes 11 and force the oil through ducts 8 into chamber 7 to move the brake plunger 6at outward and apply the brakes. When the desired pressure is obtained in cylinder 6 and chamber 7 the excess of pressure will lift valve 15 by its pressure against annular shoulder 16 into casing 17, the oil then entering casing 17 and passing into the tubular valve 15 through openings 29 in the sides thereof and flowing back to the reservoir.

To release the brakes, a piston 27 is moved inward, forcing fluid into cylinder 24 moving plunger 23 downward and thereby lifting the weighted end of lever 19 and with it valve 15, to open the port 14, so that the pistons 4 can work idly, and the oil in chamber 7 and cylinder 6 will be forced out by the inward movement of the plunger 6a and returned to the reservoir through the tubular valve 15.

It will thus be seen, that with my improved controlling means, should there be a leak in the pipe line, the weighted lever 19 will cause the valve 15 to fall and apply the brakes which renders the apparatus safe and avoids accidents.

A great many slight changes might be made in the general form and arrangement of the parts described Without departing from my invention and henceI would have it understood that I do not restrict myself to the precise details set orthbut consider myself at liberty to make such slight changes and alterations as fairly fall Within the spirit and scope of my invention.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is:-

l. In a fluid brake mechansim, the combination with a brake cylinder, a plunger therein, a pump cylinder, a duct connecting the cylinders and having a check valve, and a continuously' operating piston in the pump cylinder, of a iluid reservoir,Y a pipe connecting the latter with the pump cylinder, a duct or passage also connecting the pump cylinder with the reservoir, and a controlling valve, in said lastmentioned passage.

2. In a lluid brake mechanism, the combination with a brake cylinder, and a plunger therein, of two pump cylinders, ducts connecting the pump cylinders With the brake cylinder, check valves in said ducts, a passage connecting the pump cylinders, a controlling valve in said passage, continuously reciprocating pistons in the pump cylinders, a uid reservoir, pipes connecting the fluid in the reservoir With the pump cylinders, check valves in said pipes, and a weighted lever governing the position of the controlling valve.

3. In a fluid brake mechanism, the combination with a brake cylinder, and a plunger therein, of two pump cylinders, pistons in the pump cylinders, means for continuously reciprocating the pump pistons in opposite directions, valved ducts connecting the pump and brake cylinders, an oil reservoir, a passage connecting the pump cylinders and communicating with the reservoir above the liquid level therein, valved pipes communicating with the pump cylinders and projected below the liquid level in the reser- Voir, a controlling valve to close the said passage but normally out of the passage, means for holding the valve out of the passage and a Weighted lever to move the valve into the passage to close the same when permitted to move by said means.

4. In a fluid brake mechanism, the combination with a brake cylinder and a plunger therein, of twopump cylinders, means for continuously reciprocating the pump pistons in opposite directions, valved ducts connecting the pump and brake cylinders, a liquid reservoir, a passage connecting` the pump cylinders and communicating with the reservoir above the liquid level in the reservoir, a tubular controlling valve t9 close said passage but normally out of the passage and exhausting the liquid from the brake cylinder, and means for moving the valve to close the passage and shut oft the exhaust from the brake cylinder.

5. In a fluid brake mechanism, the combination with a brake cylinder, a pump and a reservoir, of a valve controlling the passage of the liquid from the pump to the brake cylinder' or to the reservoir and also constructed when moved to one position to exhaust from the brake cylinder back to the reservoir, and means for moving said valve.

G. In a fluid brake mechanism, the combination with a brake cylinder, a pump, and a reservoir, of a valve controlling the passage of liquid to and from the brake cylinder, and constructed to be moved to exhaust from the F 4liquid trom and back to the reservoir, a Weighted lever connected with the valve a cylinder, a plunger therein, a link connecting the plunger and lever, and means for fore ing fluid into said cylinder or permitting it to escape therefrom to more the lever and valve.

In testimony whereof, I have signed this specification in the presence of two subscribing Witnesses.

WILLIAM HENRY DAILY Witnesses S. W. FOSTER, R. S. FERGUSON. 

